adjectives - Adjectival order: “a style appropriate for” or “an appropriate style for”

I would like to understand the correct grammatical order in the sentence,

In your essay, you must use grammatically correct sentences with accurate spelling and punctuation in a style appropriate for the situation.

I hold the view that “style appropriate” is written bad because the grammatical order indicates that an adjective needs to be before the noun.

Is it grammatically correct?: NOUN + ADJECTIVE X

So,

In your essay, you must use grammatically correct sentences with accurate spelling and punctuation in an appropriate style for the situation .

It is true that it works like this ​ ADJECTIVE + NOUN ​

Resource: Cambridge English Objective First Book, Fourth Edition